libdispatch-703.1.4.tar.gz

[apple/libdispatch.git] / os / linux_base.h

diff --git a/os/linux_base.h b/os/linux_base.h
new file mode 100644 (file)
index 0000000..96a3c82
--- /dev/null
+++ b/os/linux_base.h
@@ -0,0 +1,94 @@
+/*
+ * This source file is part of the Swift.org open source project
+ *
+ * Copyright (c) 2015 Apple Inc. and the Swift project authors
+ *
+ * Licensed under Apache License v2.0 with Runtime Library Exception
+ *
+ * See http://swift.org/LICENSE.txt for license information
+ * See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+ *
+ */
+
+#ifndef __OS_LINUX_BASE__
+#define __OS_LINUX_BASE__
+
+#include <sys/user.h>
+#include <sys/param.h>
+
+#if __GNUC__
+#define OS_EXPECT(x, v) __builtin_expect((x), (v))
+#else
+#define OS_EXPECT(x, v) (x)
+#endif
+
+#ifndef os_likely
+#define os_likely(x) OS_EXPECT(!!(x), 1)
+#endif
+#ifndef os_unlikely
+#define os_unlikely(x) OS_EXPECT(!!(x), 0)
+#endif
+
+#if __has_feature(assume_nonnull)
+#define OS_ASSUME_NONNULL_BEGIN _Pragma("clang assume_nonnull begin")
+#define OS_ASSUME_NONNULL_END   _Pragma("clang assume_nonnull end")
+#else
+#define OS_ASSUME_NONNULL_BEGIN
+#define OS_ASSUME_NONNULL_END
+#endif
+
+#if __has_builtin(__builtin_assume)
+#define OS_COMPILER_CAN_ASSUME(expr) __builtin_assume(expr)
+#else
+#define OS_COMPILER_CAN_ASSUME(expr) ((void)(expr))
+#endif
+
+#if __has_feature(attribute_availability_swift)
+// equivalent to __SWIFT_UNAVAILABLE from Availability.h
+#define OS_SWIFT_UNAVAILABLE(_msg) \
+               __attribute__((__availability__(swift, unavailable, message=_msg)))
+#else
+#define OS_SWIFT_UNAVAILABLE(_msg)
+#endif
+
+#if __has_attribute(swift_private)
+# define OS_REFINED_FOR_SWIFT __attribute__((__swift_private__))
+#else
+# define OS_REFINED_FOR_SWIFT
+#endif
+
+#if __has_attribute(swift_name)
+# define OS_SWIFT_NAME(_name) __attribute__((__swift_name__(#_name)))
+#else
+# define OS_SWIFT_NAME(_name)
+#endif
+
+#define __OS_STRINGIFY(s) #s
+#define OS_STRINGIFY(s) __OS_STRINGIFY(s)
+#define __OS_CONCAT(x, y) x ## y
+#define OS_CONCAT(x, y) __OS_CONCAT(x, y)
+
+/*
+ * Stub out misc linking and compilation attributes
+ */
+
+#ifdef OS_EXPORT
+#undef OS_EXPORT
+#endif
+#define OS_EXPORT
+
+#ifdef OS_WARN_RESULT_NEEDS_RELEASE
+#undef OS_WARN_RESULT_NEEDS_RELEASE
+#endif
+
+#ifdef OS_WARN_RESULT
+#undef OS_WARN_RESULT
+#endif
+#define OS_WARN_RESULT
+
+#ifdef OS_NOTHROW
+#undef OS_NOTHROW
+#endif
+#define OS_NOTHROW
+
+#endif /* __OS_LINUX_BASE__ */